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<p>[QUOTE=&quot;Burton Strauss III, post: 2067124, member: 59677&quot;]I&#039;ve chatted with Ian on that not feature (I&#039;m surprised you didn&#039;t hear back). As an IT guy I can confirm it&#039;s a lot harder to implement than it seems, especially w/o cratering database performance.</p><p><br /></p><p>Query optimizers are strange beasts and if they see something they are not programmed to handle they punt to finding it slowly but safely. Say you have an indexed phone book and want all the John Smiths. The index takes you to the first Smith, John and you read until you find the 1st record that isn&#039;t John Smith. Fast &amp; Clean. Now find all the Smith&#039;s who are NOT John. The index can take you to the first Smith, but you have to read a lot of records both to collect the Smiths AND to exclude Johns.[/QUOTE]</p><p><br /></p>

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